The passengers find accommodation in the cars arranged along each side of the travelling structure. The cars run at a speed of about ten to fifteen miles an hour, and are caused to collide at about eight miles an hour, which is quite sufficient for amusement purposes. The principle upon which these cars are constructed renders it impossible for one to crush the other while going over it. In this device the speed of the cars is immaterial. One car may be moving very slowly--such as is the case sometimes in crowded streets--and the overtaking car, when meeting with obstructions, though it may be in close proximity, can go straight ahead just as though nothing had happened. In fact, automobiles and carts can go over the cars just as though they were mounting a gradual incline or small hill. In cases of street locomotion there is a fender effect for the safety of people crossing the streets, which picks the person up and lands him down on the other side unhurt. A great deal might be done with a system of this character, and Mr. Stern's next work will be a careful study on the lines of carrying freight, as he believes that a single line of railway may be duplexed in this manner, and thus enable more business to be carried on than by the ordinary railroad having two tracks. [Illustration: A GENERAL VIEW OF LHASSA FROM THE EAST. _From a Photo._] _The Forbidden City of Lhassa._ BY G. T. TSYBIKOV. [As soon as the brief telegraphic announcement of M. Tsybikov's remarkable journey reached England we took steps to secure the earliest account in an English magazine of this expedition. At the present moment its value is enhanced by the fact that a British mission is being dispatched into the mysterious land of Tibet. The account of "The Forbidden City of Lhassa" which follows is the first that has been written by a visitor to Lhassa since the French missionary Huc spent a few months there in 1845. It has been translated and edited for THE STRAND MAGAZINE by David B. Macgowan, by permission of the Russian Imperial Geographical Society.] M. G. T. Tsybikov is by birth a Russian Bouriat from the Trans-Baikal territory. He learned his own, the Mongolian, and the Tibetan languages in infancy and boyhood, and completed his education in the St. Petersburg schools for Oriental languages. He was sent to Tibet by the Russian Imperial Geographical Society, and his success in reaching the Tibetan capital and in remaining there or in its vicinity for more than a year was due in large measure to the careful planning of his journey by the experienced officers of this society. He carried a high-class camera of special construction and returned with a number of excellent photographs, some of which are reproduced with this article. The explorer left Lhassa on September 10th, 1901, but was detained on his return journey and did not reach the hospitable Russian consulate at Urga until the middle of last year.